Sir David Attenborough has released an audio message thanking the public for the flood of goodwill messages sent in the run-up to his 100th birthday. The veteran broadcaster said he had expected to celebrate quietly, but expressed gratitude for the well-wishes he had received. Attenborough, who was born on 8 May 1926, joined the BBC in 1952 and went on to become one of the world's most respected and influential wildlife presenters